mineral

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent to opaque green and white, with waxy to vitreous luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.6; the domed, polished form is a cabochon.

Identified August 12, 2026More mineral →

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At a glance

Common name: Polished green moss agate cabochon
Scientific name: Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals
Category: mineral
Identified: August 12, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small commercial cabochon; $30–$150+ for larger pieces with vivid, well-defined moss patterns.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, depositing chalcedony around branching mineral inclusions. Most specimens formed in Cenozoic volcanic environments, though exact age depends on locality.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; attractive patterning can make it valuable to jewelry collectors.

Geological facts

The moss-like markings are mineral inclusions, not fossils or organic plant material. Green coloration commonly results from chlorite, actinolite, or iron-bearing inclusions.

Field identification & locations

Identify it by its green dendritic or cloudlike inclusions, smooth chalcedony body, glassy polish, and lack of cleavage; common sources include India, Brazil, Uruguay, the United States, and Australia.